JP6119276B2 - Liquid ejection head and image forming apparatus - Google Patents

Description

  The present invention relates to a liquid discharge head and an image forming apparatus.

  As an image forming apparatus such as a printer, a facsimile, a copying apparatus, a plotter, and a complex machine of these, for example, a liquid discharge recording type image forming apparatus using a recording head composed of a liquid discharge head (droplet discharge head) for discharging droplets An ink jet recording apparatus or the like is known.

  In the liquid discharge head, when a foreign substance is mixed in the liquid, a droplet discharge defect occurs. Therefore, a filter member for filtering the liquid is provided in the flow path.

  Conventionally, a filter unit for filtering liquid over the entire region in the nozzle arrangement direction of a plurality of individual liquid chambers is provided between the liquid introduction unit through which all of the plurality of individual flow paths through which the nozzles communicate and the common liquid chamber. In the nozzle arrangement direction, a plurality of reinforcing ribs are formed at intervals corresponding to two or more liquid chambers, the filter portion is divided into a plurality by the reinforcing ribs, and liquid chamber interval walls are provided corresponding to the ribs. Known (Patent Document 1).

JP 2011-025663 A

  In the configuration disclosed in Patent Document 1 described above, the width in the nozzle arrangement direction of the partition provided corresponding to the reinforcing rib is narrower than the width of the reinforcing rib in the nozzle arrangement direction, and the liquid introduction into the filter portion is performed. There is a problem that stagnation occurs on the part side and the bubble discharge performance is lowered.

  This invention is made | formed in view of said subject, and aims at improving bubble discharge property.

In order to solve the above-described problem, a liquid discharge head according to claim 1 of the present invention includes:
A plurality of nozzles for discharging droplets;
A plurality of individual flow paths through which the nozzles communicate;
A liquid introduction part that leads to the plurality of individual flow paths;
A common liquid chamber for supplying a liquid to the plurality of individual flow paths,
Between the common liquid chamber and the liquid introduction part, a plurality of filter holes are formed, and a filter part for filtering the liquid is provided,
The filter part is provided with a reinforcing part that partitions into a plurality of filter regions,
A part of the reinforcing part is opposed to a part of the filter hole with a gap in the liquid flow direction ,
The reinforcing portion is provided at a position facing the partition between the individual flow channels with a member forming the filter portion interposed therebetween,
The width of the reinforcing portion in the nozzle arrangement direction is wider than the width of the partition between the individual flow paths in the nozzle arrangement direction .

  According to the present invention, the bubble discharge property can be improved.

FIG. 2 is an external perspective explanatory view of the liquid ejection head according to the first embodiment of the present invention for explaining the first embodiment. FIG. 2 is a cross-sectional explanatory diagram in a direction (liquid chamber longitudinal direction) orthogonal to the nozzle arrangement direction along the line AA in FIG. 1. It is a cross-sectional explanatory drawing of the nozzle arrangement direction (liquid chamber short direction) along the BB line of FIG. It is the plane explanatory drawing and principal part expansion explanatory drawing of a diaphragm member with which it uses for description of 1st Embodiment of this invention. It is a plane explanatory view of a channel part similarly. FIG. 8 is a cross-sectional explanatory view taken along the line DD of FIG. 7, corresponding to a cross section taken along the line CC of FIG. 5. It is expansion explanatory drawing of a filter area | region. It is equivalent to the cross section along the CC line of FIG. 5 of the comparative example 1, and is sectional explanatory drawing along the E-ED line of FIG. It is an enlarged explanatory view of a filter area in the same manner. It is explanatory drawing with which it uses for description of the difference in the flow velocity in a comparative example and embodiment. It is sectional explanatory drawing similar to FIG. 6 with which it uses for description of 2nd Embodiment of this invention. FIG. 4 is a side explanatory view of a mechanism portion for explaining an example of an image forming apparatus according to the present invention. It is principal part plane explanatory drawing of the mechanism part.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. A liquid discharge head according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective explanatory view of the head, FIG. 2 is a cross-sectional explanatory view in a direction (longitudinal direction of the liquid chamber) orthogonal to the nozzle arrangement direction along the line AA in FIG. 1, and FIG. It is sectional explanatory drawing of the nozzle arrangement | sequence direction (liquid chamber short direction) in alignment with a line.

  In this liquid discharge head, a nozzle plate 1, a flow path plate (liquid chamber substrate) 2, and a vibration plate member 3 as a thin film member are laminated and joined. And the piezoelectric actuator 11 which displaces the diaphragm member 3 and the frame member 20 are provided as a common flow path member.

  The nozzle plate 1, the flow path plate 2 and the vibration plate member 3 are also called individual liquid chambers (pressurization liquid chamber, pressure chamber, pressurization chamber, flow path, etc.) communicating with a plurality of nozzles 4 for discharging droplets. 6. A liquid supply path 7 also serving as a fluid resistance section for supplying a liquid to the individual liquid chamber 6 and a liquid introduction section 8 connected to the liquid supply path 7 are formed. Here, the individual flow path 5 is constituted by the liquid supply path 7 including the individual liquid chamber 6 and the fluid resistance portion. However, when the individual liquid chamber 6 is communicated directly from the liquid introduction portion 8 without having the fluid resistance portion. The individual liquid chamber 6 becomes an individual flow path.

  Then, the liquid is supplied from the common liquid chamber 10 serving as the common flow path of the frame member 20 to the plurality of individual liquid chambers 6 through the filter portion 9 formed on the diaphragm member 3 through the liquid introduction portion 8 and the liquid supply path 7. .

  Here, the nozzle plate 1 is formed of a nickel (Ni) metal plate and is manufactured by an electroforming method (electroforming). Not limited to this, other metal members, resin members, laminated members of resin layers and metal layers, and the like can be used. In the nozzle plate 1, for example, nozzles 4 having a diameter of 10 to 35 μm are formed corresponding to the respective liquid chambers 6 and bonded to the flow path plate 2 with an adhesive. Further, a water repellent layer is provided on the droplet discharge side surface (surface in the discharge direction: discharge surface or the surface opposite to the liquid chamber 6 side) of the nozzle plate 1.

  The flow path plate 2 is formed by etching the single crystal silicon substrate to form grooves that constitute the individual liquid chamber 6, the liquid supply path 7, the liquid introduction part 8, and the like. The flow path plate 2 can also be formed, for example, by etching a metal plate such as a SUS substrate with an acidic etching solution, or performing machining such as pressing.

  The vibration plate member 3 also serves as a wall surface member that forms the wall surface of the individual liquid chamber 6 of the flow path plate 2, and has a deformable vibration region 30 at a portion corresponding to the individual liquid chamber 6. The diaphragm member 3 is also formed from a nickel (Ni) metal plate and is manufactured by an electroforming method (electroforming). Not limited to this, other metal members, resin members, laminated members of resin layers and metal layers, and the like can be used.

  A piezoelectric actuator 11 including an electromechanical conversion element as a driving means (actuator means, pressure generating means) for deforming the vibration region 30 of the diaphragm member 3 on the opposite side of the diaphragm member 3 from the individual liquid chamber 6. Is arranged.

  The piezoelectric actuator 11 has a plurality of laminated piezoelectric members 12 bonded with adhesive on a base member 13, and the piezoelectric member 12 is grooved by half-cut dicing to have a required number of piezoelectric members 12. Piezoelectric columns 12A and 12B are formed in a comb shape at a predetermined interval.

  The piezoelectric columns 12A and 12B of the piezoelectric member 12 are the same, but a piezoelectric column that is driven by giving a driving waveform is a driving piezoelectric column (driving column) 12A, and a piezoelectric column that is used as a simple column without giving a driving waveform. It is distinguished as a non-driving piezoelectric column (non-driving column) 12B.

  The drive column 12A is joined to an island-shaped convex portion 30a formed in the vibration region 30 of the diaphragm member 3. Further, the non-driving column 12B is joined to the convex portion 30b of the diaphragm member 3.

  This piezoelectric member 12 is formed by alternately laminating piezoelectric layers and internal electrodes, and each internal electrode is pulled out to the end face to be provided with an external electrode, and can be used to supply a drive signal to the external electrode of the drive column 12A. An FPC 15 as a flexible wiring board having flexibility is connected.

  The frame member 20 is formed by injection molding using, for example, epoxy resin or thermoplastic resin such as polyphenylene sulfite, and a common liquid chamber 10 to which liquid is supplied from a head tank or a liquid cartridge (not shown) is formed.

  In the liquid discharge head configured as described above, for example, the drive column 12A contracts by lowering the voltage applied to the drive column 12A from the reference potential, and the vibration region 30 of the diaphragm member 3 descends, so that the individual liquid chambers 6 As the volume expands, the liquid flows into the individual liquid chamber 6.

  Thereafter, the voltage applied to the drive column 12A is increased to extend the drive column 12A in the stacking direction, the vibration region 30 of the diaphragm member 3 is deformed in the nozzle 4 direction, and the volume of the individual liquid chamber 6 is contracted. The liquid in the individual liquid chamber 6 is pressurized, and droplets are ejected (jetted) from the nozzle 4.

  Then, by returning the voltage applied to the drive column 12A to the reference potential, the vibration region 30 of the diaphragm member 3 is restored to the initial position, and the individual liquid chamber 6 expands to generate a negative pressure. The liquid is filled into the individual liquid chamber 6 from the liquid chamber 10 through the liquid supply path 7. Therefore, after the vibration of the meniscus surface of the nozzle 4 is attenuated and stabilized, the operation proceeds to the next droplet discharge.

  Note that the driving method of the head is not limited to the above example (pulling-pushing), and it is also possible to perform striking or pushing depending on the direction to which the driving waveform is given.

  Next, a first embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a plan explanatory view and an enlarged explanatory view of the main part of the diaphragm member for explaining the embodiment, FIG. 5 is a plan explanatory view of the flow path portion, and FIG. 6 is a cross-sectional view taken along line CC in FIG. FIG. 7 is an explanatory sectional view taken along the line DD of FIG. 7, and FIG. 7 is an enlarged explanatory view of the filter region.

  First, as shown in FIG. 4, the diaphragm member 3 is provided with a filter unit 9 for filtering liquid between the common liquid chamber 10 and the liquid introducing unit 8, and the filter unit 9 passes the liquid. A large number of filter holes 91 are formed.

  Here, as shown in FIG. 5, the liquid introduction part 8 side is divided into liquid introduction parts 8 for each individual flow path 5 by extending the partition walls 51 between the individual flow paths 5. However, it can be divided so that one liquid introduction part 8 leads to two or more individual flow paths 5, or one liquid introduction part 8 can lead to all the individual flow paths 5. .

  On the other hand, as shown in FIG. 6, the filter portion 9 side is also divided into filter regions 9 </ b> A for each individual flow path 5 by providing a reinforcement portion 92 that is a reinforcement region facing the partition wall 51 on the liquid introduction portion 8 side. doing. The reinforcing portion 92 is provided for each of the two or more individual flow paths 5, and the filter section 9 is divided into a plurality of filter areas 9A, and one filter area 9A is divided so as to correspond to the two or more individual flow paths 5. May be.

  The width of the reinforcing portion 92 in the nozzle arrangement direction is wider than the width of the partition walls 51 between the individual flow paths 5 in the nozzle arrangement direction.

  Moreover, the diaphragm member 3 forming the filter portion 9 uses a three-layer structure formed by Ni electroforming as described above. As shown in FIG. 6, the filter portion 9 is formed of the same first layer 93 a as the first layer of the diaphragm member 3. The reinforcing portion 92 has a two-layer structure formed by the second layer of the diaphragm member 3, the second layer 93 b that is the third layer, and the third layer 93 c.

  The reason why the reinforcing part 92 is provided in the filter part 9 is as follows. That is, since the filter unit 9 has a single-layer shape in this embodiment, if the filter unit 9 is formed over the region where the individual flow paths 5 are arranged, the rigidity of the filter unit 9 decreases. It becomes easy to break. Therefore, the strength of the filter portion 9 is reinforced by forming the reinforcing portions 92 having a multi-layer structure at regular intervals in the nozzle arrangement direction and partitioning the filter portion 9. Furthermore, since the reinforcing part 92 is provided, the diaphragm member 3 can be sufficiently pressurized at the time of joining with the flow path plate 2, so that there is an advantage that the joining strength is increased.

  In this case, on the filter region 9A side of the second layer 93b and the third layer 93c constituting the reinforcing portion 92, a portion (hereinafter referred to as “overhang shape portion”) 93d that is overhanged by electroforming is formed. Arise.

The second layer 93b, which is a part of the reinforcing portion 92, faces the filter portion 9 (first layer 93a) with a gap 94 therebetween, and the overhang portion 93d has a liquid flow direction (arrow in FIG. 6). In the F direction), it is opposed to a part of the filter hole 91 with a gap (hereinafter referred to as “overlap”).
doing.

  That is, the second layer 93b constituting the reinforcing portion 92 of the filter portion 9 is formed so as to protrude into the filter region 9A.

  As a result, as shown in FIG. 7, the filter region 9 </ b> A is seen in the liquid flow direction, and some of the filter holes 91 a of the filter holes 91 are projected from the liquid flow direction more than the other filter holes 91. The area becomes smaller.

  In other words, in the present embodiment, the filter hole 91 is formed close to the partition wall 51 of the individual flow path 5.

  In other words, the first layer 93a of the electroformed layer forming the filter hole 91 is formed with a thickness of about 3 μm, but the thickness is provided to reinforce this and partition the filter portion 9 into the filter region 9A. The second layer 93b and the third layer 93c are present.

  The filter hole 91 is disposed closer to the partition wall 51 than the second layer 93b in order to secure a wider area for forming the filter hole 91 than the area formed by the second layer 93b and the third layer 93c. .

  By adopting such a structure, the filter arrangement area is enlarged and the stagnation point is reduced. Therefore, when suction / pressure is applied, an ink flow is generated on the downstream side of the filter unit 9 and air bubbles are easily generated. It can be discharged.

  Here, the comparative example 1 is demonstrated with reference to FIG.8 and FIG.9. 8 corresponds to a cross section taken along line CC in FIG. 5 of Comparative Example 1, and is a cross-sectional explanatory view taken along line E-ED in FIG. 9, and FIG. 9 is also an enlarged explanatory view of the filter region.

  In the first comparative example, the filter hole 91 is not formed at a position overlapping with the second layer 92b constituting the reinforcing portion 92 in the liquid flow direction.

  In the configuration of Comparative Example 1, as shown in FIG. 10A, the flow velocity immediately after passing through the filter hole 91 is substantially the same regardless of which filter hole 91 is passed. In FIG. 10, the flow is indicated by an arrow, the length of the arrow indicates the flow velocity, and the longer the arrow, the greater the flow velocity.

  Therefore, if the width of the partition wall 51 on the liquid introduction part 8 side is narrower than the reinforcement part 92, a stagnation point may be generated on the liquid introduction part 8 side, and bubbles may stay.

  On the other hand, in the present embodiment, as shown in FIG. 10B, the filter hole 91a at the position overlapping the second layer 93b and the like constituting the reinforcing portion 92 is the other in the liquid flow direction. The projected area is smaller than that of the filter hole 91, and the flow velocity is slightly increased as compared with the other filter holes 91.

  That is, when the width of the partition wall 51 on the liquid introduction part 8 side is narrower than that of the reinforcing part 92, the flow velocity becomes small on the downstream side of the region protruding from the filter part 9 of the reinforcing part 92, and bubbles remain. However, as in the present embodiment, a part of the filter hole 92a located on the partition wall 51 side in the filter part 9 is overlapped with the reinforcing part 92 protruding to the filter part 9, thereby reducing the projected area of the filter hole 92a. The flow rate in this region is increased by decreasing the size.

  Thereby, even when the width of the partition wall 51 on the liquid introduction part 8 side is narrower than that of the reinforcement part 92, no stagnation point is generated on the liquid introduction part 8 side, and the bubbles are discharged at a high flow rate. Staying is prevented.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 11 is an explanatory sectional view similar to FIG. 6 for explaining the embodiment.

  In the present embodiment, the width in the nozzle arrangement direction of the third layer 93c constituting the reinforcing portion 92 in the first embodiment is the same as that of the second layer 93b.

  Even with such a configuration, the same effects as those of the first embodiment can be obtained.

  Next, an example of the image forming apparatus according to the present invention including the liquid discharge head according to the present invention will be described with reference to FIGS. FIG. 12 is an explanatory side view of the mechanism part of the apparatus, and FIG. 13 is an explanatory plan view of the main part of the mechanism part.

  This image forming apparatus is a serial type image forming apparatus, and a carriage 233 is slidably held in a main scanning direction by main and slave guide rods 231 and 232 which are guide members horizontally mounted on left and right side plates 221A and 221B. . Then, the main scanning motor (not shown) moves and scans in the direction indicated by the arrow (carriage main scanning direction) via the timing belt.

  The carriage 233 is supplied with ink supplied to the same head as the liquid discharge head according to the present invention for discharging ink droplets of each color of yellow (Y), cyan (C), magenta (M), and black (K). A recording head 234 in which a storage tank is integrated is mounted. The recording head 234 is mounted with a nozzle row composed of a plurality of nozzles arranged in the sub-scanning direction orthogonal to the main scanning direction and the ink droplet ejection direction facing downward.

  Each recording head 234 has two nozzle rows. Then, one nozzle row of one recording head 234a discharges black (K) droplets, and the other nozzle row discharges cyan (C) droplets. Also, one nozzle row of the other recording head 234b discharges magenta (M) droplets, and the other nozzle row discharges yellow (Y) droplets. Here, a configuration in which droplets of four colors are ejected in a two-head configuration is used, but it is also possible to arrange four nozzle rows per head and eject each of the four colors with one head.

  Further, the ink of each color is replenished and supplied from the ink cartridge 210 of each color to the tank 235 of the recording head 234 via the supply tube 236 of each color.

  On the other hand, as a paper feeding unit for feeding the paper 242 stacked on the paper stacking unit (pressure plate) 241 of the paper feed tray 202, a half-moon roller (feeding) that separates and feeds the paper 242 one by one from the paper stacking unit 241. Paper roller) 243 and a separation pad 244 facing the paper feed roller 243.

  A guide 245 for guiding the paper 242, a counter roller 246, a conveyance guide member 247, and a tip pressure roller 249 are used to feed the paper 242 fed from the paper feeding unit to the lower side of the recording head 234. And a pressing member 248 having Further, a transport belt 251 is provided as a transport unit for electrostatically attracting the fed paper 242 and transporting it at a position facing the recording head 234.

  The conveyor belt 251 is an endless belt, and is configured to wrap around the conveyor roller 252 and the tension roller 253 so as to circulate in the belt conveyance direction (sub-scanning direction). In addition, a charging roller 256 that is a charging unit for charging the surface of the transport belt 251 is provided. The charging roller 256 is disposed so as to come into contact with the surface layer of the conveyor belt 251 and to rotate following the rotation of the conveyor belt 251. The transport belt 251 rotates in the belt transport direction when the transport roller 252 is rotationally driven through timing by a sub-scanning motor (not shown).

  Further, as a paper discharge unit for discharging the paper 242 recorded by the recording head 234, a separation claw 261 for separating the paper 242 from the transport belt 251, a paper discharge roller 262, and a paper discharge roller 263 are provided. A paper discharge tray 203 is provided below the paper discharge roller 262.

  A double-sided unit 271 is detachably attached to the back surface of the apparatus main body. The duplex unit 271 takes in the paper 242 returned by the reverse rotation of the transport belt 251, reverses it, and feeds it again between the counter roller 246 and the transport belt 251. The upper surface of the duplex unit 271 is a manual feed tray 272.

  Further, a maintenance / recovery mechanism 281 for maintaining and recovering the nozzle state of the recording head 234 is disposed in a non-printing area on one side in the scanning direction of the carriage 233.

  The maintenance / recovery mechanism 281 includes cap members (hereinafter referred to as “caps”) 282a and 282b (hereinafter referred to as “caps 282” when not distinguished) for capping the nozzle surfaces of the recording head 234. . The maintenance and recovery mechanism 281 includes a wiper blade 283 that is a blade member for wiping the nozzle surface. The maintenance / recovery mechanism 281 includes an empty discharge receiver 284 that receives droplets when performing empty discharge for discharging droplets that do not contribute to recording in order to discharge the thickened recording liquid.

  In addition, in the non-printing area on the other side of the carriage 233 in the scanning direction, there is an empty space for receiving a liquid droplet when performing an empty discharge for discharging a liquid droplet that does not contribute to recording in order to discharge the recording liquid thickened during recording or the like. A discharge receiver 288 is disposed. The idle discharge receiver 288 includes an opening 289 along the nozzle row direction of the recording head 234 and the like.

  In this image forming apparatus configured as described above, the sheets 242 are separated and fed one by one from the sheet feeding tray 202, and the sheet 242 fed substantially vertically upward is guided by the guide 245, and is conveyed to the conveyor belt 251 and the counter. It is sandwiched between the rollers 246 and conveyed. Further, the leading edge of the sheet 242 is guided by the conveying guide 237 and pressed against the conveying belt 251 by the leading end pressing roller 249, and the conveying direction is changed by approximately 90 °.

  When the paper 242 is fed onto the charged transport belt 251, the paper 242 is attracted to the transport belt 251, and the paper 242 is transported in the sub-scanning direction by the circular movement of the transport belt 251.

  Therefore, by driving the recording head 234 according to the image signal while moving the carriage 233, ink droplets are ejected onto the stopped paper 242 to record one line, and after the paper 242 is conveyed by a predetermined amount, Record the next line. Upon receiving a recording end signal or a signal that the trailing edge of the paper 242 has reached the recording area, the recording operation is finished and the paper 242 is discharged onto the paper discharge tray 203.

  As described above, since the image forming apparatus includes the liquid discharge head according to the present invention as a recording head, a high-quality image can be stably formed.

  In the present application, the “paper” is not limited to paper, but includes OHP, cloth, glass, a substrate, etc., and means a material to which ink droplets or other liquids can be attached. , Recording media, recording paper, recording paper, and the like. In addition, image formation, recording, printing, printing, and printing are all synonymous.

  The “image forming apparatus” means an apparatus that forms an image by discharging liquid onto a medium such as paper, thread, fiber, fabric, leather, metal, plastic, glass, wood, ceramics, etc. “Formation” means not only giving an image having a meaning such as a character or a figure to a medium but also giving an image having no meaning such as a pattern to the medium (simply causing a droplet to land on the medium). ) Also means.

  The “ink” is not limited to an ink unless otherwise specified, but includes any liquid that can form an image, such as a recording liquid, a fixing processing liquid, or a liquid. Used generically, for example, includes DNA samples, resists, pattern materials, resins, and the like.

  In addition, the “image” is not limited to a planar image, and includes an image given to a three-dimensionally formed image and an image formed by three-dimensionally modeling a solid itself.

  Further, the image forming apparatus includes both a serial type image forming apparatus and a line type image forming apparatus, unless otherwise limited.

DESCRIPTION OF SYMBOLS 1 Nozzle plate 2 Flow path plate 3 Vibrating plate member 4 Nozzle 5 Individual flow path 6 Individual liquid chamber 8 Liquid introduction part 9 Filter part 9A Filter area 10 Common liquid chamber 12 Piezoelectric member 20 Frame member 51 Partition between individual flow paths 91 Filter Hole 92 Reinforcing part 233 Carriage 234a, 234b Recording head

Claims (5)

A plurality of nozzles for discharging droplets;
A plurality of individual flow paths through which the nozzles communicate;
A liquid introduction part that leads to the plurality of individual flow paths;
A common liquid chamber for supplying a liquid to the plurality of individual flow paths,
Between the common liquid chamber and the liquid introduction part, a plurality of filter holes are formed, and a filter part for filtering the liquid is provided,
The filter part is provided with a reinforcing part that partitions into a plurality of filter regions,
A part of the reinforcing part is opposed to a part of the filter hole with a gap in the liquid flow direction ,
The reinforcing portion is provided at a position facing the partition between the individual flow channels with a member forming the filter portion interposed therebetween,
The liquid discharge head according to claim 1, wherein a width of the reinforcing portion in the nozzle arrangement direction is wider than a width of the partition between the individual flow paths in the nozzle arrangement direction . A plurality of nozzles for discharging droplets;
A plurality of individual flow paths through which the nozzles communicate;
A liquid introduction part that leads to the plurality of individual flow paths;
A common liquid chamber for supplying a liquid to the plurality of individual flow paths,
Between the common liquid chamber and the liquid introduction part, a plurality of filter holes are formed, and a filter part for filtering the liquid is provided,
The filter part is provided with a reinforcing part that partitions into a plurality of filter regions,
A part of the reinforcing part is opposed to a part of the filter hole with a gap in the liquid flow direction,
The liquid ejection head, wherein the filter portion is formed on a diaphragm member that forms a wall surface of the individual flow path. The reinforcing portion, the liquid discharge head according to claim 1 or 2, characterized in that forms at least two-layer structure. The reinforcing portion is provided at a position facing the partition between the individual flow channels with a member forming the filter portion interposed therebetween,
The liquid ejection head according to claim 2 , wherein a width of the reinforcing portion in the nozzle arrangement direction is wider than a width of the partition between the individual flow paths in the nozzle arrangement direction.   An image forming apparatus comprising the liquid discharge head according to claim 1.

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